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(No Model.)

R. D. GRAY.

2 Sheets-Shea); 1.

SERIES PHOTGGRAPHIC CAMERA.

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ATTO/mers.

(No Model.) 2 Sheets-Sheet 2. I

-R.'D.GRAY.. 5 SERIES PIIO'IO'GRAPHI() GAMER-A.

No. 540,545. f Y Patented June 4,- 1895.

w/ /vEssEs.- I WEA/ron W i ATTORNEYS UNITED STATES PATENT OFFICE.

ROBERT GRAY, OF NEW YORK, N.Y.

SERIES PHOTOGRPHIC CAM ERA.

' srncmcarzox forming pm of Letters Patent Na 540,545, cared .time 4,1895.

' VApplication filed Horch 9, 1895. Serial No. 541,135. (No model.)

To all whom it may concern..-

Be itknown that' I, ROBERT D. GRAY, of New York city, in the county and State of New York, have invented a. newand'Improved Photographic Camera, of which the following is a' full, clear, and exact description.

The object of my invention is to construct' a photographic camerafor taking a series of photographic pictures of moving objects, and for progeeting the pictures thus produced on 'a screen by the aid of a suitable illuminant and light-controiling devices attached to the camera. 1

The object is also to provide apparatus for taking a continuons series ot pictures so that all the movements of the object are represented in the pictures when projected. y

biy object is also to produce two series of photographs, the separate pictures of which will be made in alternation, the movement of the sensitive iilm required for bringing it into position for the exposure of one series Alter natiug with the movement required tobring another portion of the tilm into position for exposure for a picture of the other series, so that the said movements may each be made with one half the speed that would be required for producing a succession of exposures with intervals of darkness.

Myinvention consists in a camera provided with an objective, a strip of unexposed'sensitive film, guides for holding the film in two focal planes at rightangles to each other, a plane segmental revolving mirror arranged on a plane at an angle of forty-five degrees with the axial line of the objective, and constructed to eclipse the direct light beam entering the camera and at the same time reflect it laterally to the portion of the sensitive tilm lying parallel with the axial line of the lynsf". It also consists in devices for moving two portions of the film in alternation along the two focal planes by a step-by-step movement, all as hereinafter more fully described.

Reference is to oe had to the accompanying d rawngs, forming a partei this specification,

in which similar letters of reference indicate corresponding parte in all the views.

Figure 1 is a horizontal section of my im proved camera, teken on line l 1 in Fig. 2. Fig. 2 is a vertica sestion of the same, taken on line 2,2 in Fig. 1. Fig. 3 is a front elevation of the segmental revolving mirror. Fig. 4 is a side elevation of the same, and Fig. 5 isa plan view showing the application of the camera to projection.

The box A, which contains the mechanical strip to be exposed,and the rollers ab' being at the other side.

.The sensitive strip D is designed to receive two series 'of impressions, one above the other, and-since the pictures'of the twoseries are taken'at dierent' times with the same lens, the portions of the strip receiving the impression are held in the same horizontal plane, as shown in Fig. 2. On. a line bisecting theangle formed by prolonging the two focal planes represented by the portionsof the lm in the film guides, is arranged a revolvlng segmental mirror E, whose plane of rotation intersects the prolongation of the axis of the lens Bat an angleof forty-fivede1 grecs, so that when the mirr revolves, it intercepts the be'ani of light entering' the camera once during each revolution. The direct beam passes tothe portion of the film inthe guide C, and the reflected beam passes laterally at right'angles to the portion of the film in the guide C'. The duration of the time .during which the beam .is reflected is proportionate to the time during which the direct beam is passing, so that the exposures by the' direct beam id reflected beam are equal. The two series of pictures being thus made on the same strip, one series above the other, the upper half of the film being used in the present oase for the series of pictures taken by the direct beam, and the lower half being need for the pictures taken bythe reflected beam, it is necessary to elevate the tilmguide C', as shown in Fig. 2, to bring thelower portion of the lm into position for exposure.

l It is obviously possible to produce the necessary movements of the film and the rotary motionrof the segmental mirror by dierent means. I shall procedto describe one way of doing it, butl do nottlimit myself to this par ticular way. t A

The segmental' mirror E is mounted on a wheel e carried by the horizontal shaft f journaled in the standard The'mirror covers one half of the wheel, or as much more as'may he required to secure anequal illumination of the film. The portion ol!A tlewheel not cow.

F is secured to-the-bot'tomof 4the camera box .A, and the pinion iris engaged-bye. spur wheel.

G, mounted on the shaftH jonrnaled in bearings in the camera box'." I n abridge k at one side of the wheelG is 'journaled -a shaft l, to

which .is secured a pinion m, which is en! I .gaged by the spur-wheel G, and upon-the shaft'l is secured a'roller u, against which ispressed-a roll L-ofrexposed sensitized film.-- The xolleroV on which the exposed sensitizedfilm is wound is jonrnaled at one en d in a sliding journalbox p, placed in aslot inthie bridge kiind pressed forward by a spiral spring q placed in the slot of the bridge. The other end of the roller ois journaled-in a similar springfpressed sliding boxzbelow the roll of,ln1.. Whenthe wheel.

G, and consequently the wheel 'm and roller 'n are revolved, the roll I is'turnedlln the"di rectiori. required for-rolling the film. At the opposite sidevof-the camera box is arranged a bridgek' carrying a wheel: m, a rollern a roller o' carrying the roll 1 of unexposed film, the roller o being jonrnaled ina sliding journalv box p' pressed forward toward the "roller 'n' by. the spring qf. Thefilm D'l whichv is continuous. from the roll I'fto'the roll I,

passes through the film guides C C', and as it'. vis unwoun'd from theroll o'-and woundupon` the roll o, the said roll o .is arranged to revlve in theq-:zoppositedirection. Toseoure this movement aud'at the same ,time-to increase the distance of the roll of unexposed filmfrom. the film guidespan intermediate wheel Ir is' placed between the wheel m' and the mainpwheel G. On opposite sides of the wheel.A G fare journaled shafts s s-, carryingV spur wheels l `t,engaged by the spur wheel G. To th`e shafts s si. are securedicra'nks nu', pivotally connected with' rodsv. 1,f, -which are forked at their-free ends, the ends of the tines of the-forks being bent at right angles, and beveled to forln hooks w for engagement with and lower edges withperforations as'lfor receiving the. hookaw at the ends ofthe forks. The forked rods v tfare arranged to act on the portions of -tho film held by the guides C C', and are pressed forward a ainst the film by sprlngsy secured to a tix portion of the heretofore in use. l

Havingthus described my invention, 1.1

Kappar-stufe. The hooks n. are thus arrangedv to reciprocate Ain'planes at right angles togaeh other. They are also `geared so as to work in valternation. l

The beam of light entering the camera f through the lensiB, passes to the portion of the'lilm-in the guide Clthrough the open4 por tin of the wheel e, while the portiolt of the film being exposed is at rest. As soon as the mirror'E' in its revolnt'ion'intersects theliglrlz beam, the portionjof the film in the'guide is exposediby the reflected beam and the pori-"i" tior just exposed by tlie direct beam is moved along one space bythe hooksw of'the rod-vf there being snfiicient slack in the film DT between the guides C and C 'i/O allow 0f this movement. When the direct beam is 'again' al v guide AC, the portionlof `the'lil'min the Ig'uide along by the hooks w of'the.-rodv','there belowed `to fall on .the portion of the film in vthe '8S C justexposed by the reflected beantis'mcved ingsncient slack-in'.- the film'f to .admit of A this movement. In this, manner` the -exposures are made in alternation, -and the' lm is moved `alongfand rolled-and' unrolled automatically.-`

When the film `has been developed and printed on a similar film for `projection,jthe

in the-present caseare electric are, lights, the light being converged by 'condensers as in-an -ordinary optical lantern. The-film is drawn along'by the stepbygstep motion, asdc'scribed in the operation of taking the impressions and the projection is alternately by'direct andretiected-beams.

w The picture which is reversed in taking by 'reflection is corrected when reversed in projection by-refiectionlV lt is obvious thatby means of my improvement I am enabled to make continuons ex.

posures without'. any periods of darkness, and that I am enabled to project the. pictures iwithout any interruption of the light, thus producing better effects on a larger scalethan is possible with'the methods and apparatus claim as new and desire to secure by Letters Patent- 1. In a 'photographic camera of the oharacter described, the combination of a lens, two

film` guides arranged at rghtangles to each other, means for moving forward the film-in the guides, and a segmental mirror arranged to act as a shutter for oneV field and a means of directing lightto the other field, substantially a's'specifed.

2. I n a photographic camera of thecharac- -ter. described, the combination-of 'a photographic lensftwo film guides placed at right angles to each other, a' revoluble segmental mirror placed. in a plane intersecting the an glee formed by the planesof the film' guides, and mechanism for moving the film forward with a step-by-step motion, substantially as specified:

3. In acamera for takingnegatives of mo'vingr objects, the combination of. e. lens, two lm guides, a perforated film passing through the guides, n, revolvingsegmental mirror, and

reciprocating hooks- 'for carrying thellm through the guides, as speciied.-

4. The combination, with a camera provided with a lens, revolving segmental mirror, and duplicate film-moving m echanism,of light furnishing and controlling devices-for projectnga direct and a. reflected beam in alternation. l'

5. The method of taking a series of photographic pictures to Arepresent motion, which consistsin exposing a sensitive lm to a cont'inons beam of light directed on ftwo fields of exposure in alternation, thereby forming a series oflimage representing all the movements of the mpviugbodjn 6. The method 'of taking a. series of photo-` graphic pictures, which consists in taking an image on a sensitized surface by adirect continuous beam of light, then covering the exposed surface and replacing the exposed surface while covered wth'an ,nnexpos'ed sensitzed surface and simultaneously deilecting the lightbeam to another surface, thenretuining the direct beain tothe replaced surface, and at the Sametime replacing the surface exposed by the deected beam by an unexposed surface, as herein specified.

- ROBERT D. GR'AY.

Witnesses:

. C. SEDGWICK,

F. W. HAN/trom). 

